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<a class="jxr_linenumber" name="1" href="#1">1</a>   <em class="jxr_comment">/*</em>
<a class="jxr_linenumber" name="2" href="#2">2</a>   <em class="jxr_comment"> * Copyright 2012 The Netty Project</em>
<a class="jxr_linenumber" name="3" href="#3">3</a>   <em class="jxr_comment"> *</em>
<a class="jxr_linenumber" name="4" href="#4">4</a>   <em class="jxr_comment"> * The Netty Project licenses this file to you under the Apache License,</em>
<a class="jxr_linenumber" name="5" href="#5">5</a>   <em class="jxr_comment"> * version 2.0 (the "License"); you may not use this file except in compliance</em>
<a class="jxr_linenumber" name="6" href="#6">6</a>   <em class="jxr_comment"> * with the License. You may obtain a copy of the License at:</em>
<a class="jxr_linenumber" name="7" href="#7">7</a>   <em class="jxr_comment"> *</em>
<a class="jxr_linenumber" name="8" href="#8">8</a>   <em class="jxr_comment"> *   <a href="http://www.apache.org/licenses/LICENSE-2.0" target="alexandria_uri">http://www.apache.org/licenses/LICENSE-2.0</a></em>
<a class="jxr_linenumber" name="9" href="#9">9</a>   <em class="jxr_comment"> *</em>
<a class="jxr_linenumber" name="10" href="#10">10</a>  <em class="jxr_comment"> * Unless required by applicable law or agreed to in writing, software</em>
<a class="jxr_linenumber" name="11" href="#11">11</a>  <em class="jxr_comment"> * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT</em>
<a class="jxr_linenumber" name="12" href="#12">12</a>  <em class="jxr_comment"> * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the</em>
<a class="jxr_linenumber" name="13" href="#13">13</a>  <em class="jxr_comment"> * License for the specific language governing permissions and limitations</em>
<a class="jxr_linenumber" name="14" href="#14">14</a>  <em class="jxr_comment"> * under the License.</em>
<a class="jxr_linenumber" name="15" href="#15">15</a>  <em class="jxr_comment"> */</em>
<a class="jxr_linenumber" name="16" href="#16">16</a>  <em class="jxr_comment">/*</em>
<a class="jxr_linenumber" name="17" href="#17">17</a>  <em class="jxr_comment">Copyright (c) 2000,2001,2002,2003 ymnk, JCraft,Inc. All rights reserved.</em>
<a class="jxr_linenumber" name="18" href="#18">18</a>  
<a class="jxr_linenumber" name="19" href="#19">19</a>  <em class="jxr_comment">Redistribution and use in source and binary forms, with or without</em>
<a class="jxr_linenumber" name="20" href="#20">20</a>  <em class="jxr_comment">modification, are permitted provided that the following conditions are met:</em>
<a class="jxr_linenumber" name="21" href="#21">21</a>  
<a class="jxr_linenumber" name="22" href="#22">22</a>  <em class="jxr_comment">  1. Redistributions of source code must retain the above copyright notice,</em>
<a class="jxr_linenumber" name="23" href="#23">23</a>  <em class="jxr_comment">     this list of conditions and the following disclaimer.</em>
<a class="jxr_linenumber" name="24" href="#24">24</a>  
<a class="jxr_linenumber" name="25" href="#25">25</a>  <em class="jxr_comment">  2. Redistributions in binary form must reproduce the above copyright</em>
<a class="jxr_linenumber" name="26" href="#26">26</a>  <em class="jxr_comment">     notice, this list of conditions and the following disclaimer in</em>
<a class="jxr_linenumber" name="27" href="#27">27</a>  <em class="jxr_comment">     the documentation and/or other materials provided with the distribution.</em>
<a class="jxr_linenumber" name="28" href="#28">28</a>  
<a class="jxr_linenumber" name="29" href="#29">29</a>  <em class="jxr_comment">  3. The names of the authors may not be used to endorse or promote products</em>
<a class="jxr_linenumber" name="30" href="#30">30</a>  <em class="jxr_comment">     derived from this software without specific prior written permission.</em>
<a class="jxr_linenumber" name="31" href="#31">31</a>  
<a class="jxr_linenumber" name="32" href="#32">32</a>  <em class="jxr_comment">THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,</em>
<a class="jxr_linenumber" name="33" href="#33">33</a>  <em class="jxr_comment">INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND</em>
<a class="jxr_linenumber" name="34" href="#34">34</a>  <em class="jxr_comment">FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JCRAFT,</em>
<a class="jxr_linenumber" name="35" href="#35">35</a>  <em class="jxr_comment">INC. OR ANY CONTRIBUTORS TO THIS SOFTWARE BE LIABLE FOR ANY DIRECT, INDIRECT,</em>
<a class="jxr_linenumber" name="36" href="#36">36</a>  <em class="jxr_comment">INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT</em>
<a class="jxr_linenumber" name="37" href="#37">37</a>  <em class="jxr_comment">LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,</em>
<a class="jxr_linenumber" name="38" href="#38">38</a>  <em class="jxr_comment">OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF</em>
<a class="jxr_linenumber" name="39" href="#39">39</a>  <em class="jxr_comment">LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING</em>
<a class="jxr_linenumber" name="40" href="#40">40</a>  <em class="jxr_comment">NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,</em>
<a class="jxr_linenumber" name="41" href="#41">41</a>  <em class="jxr_comment">EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.</em>
<a class="jxr_linenumber" name="42" href="#42">42</a>  <em class="jxr_comment"> */</em>
<a class="jxr_linenumber" name="43" href="#43">43</a>  <em class="jxr_comment">/*</em>
<a class="jxr_linenumber" name="44" href="#44">44</a>  <em class="jxr_comment"> * This program is based on zlib-1.1.3, so all credit should go authors</em>
<a class="jxr_linenumber" name="45" href="#45">45</a>  <em class="jxr_comment"> * Jean-loup Gailly(jloup@gzip.org) and Mark Adler(madler@alumni.caltech.edu)</em>
<a class="jxr_linenumber" name="46" href="#46">46</a>  <em class="jxr_comment"> * and contributors of zlib.</em>
<a class="jxr_linenumber" name="47" href="#47">47</a>  <em class="jxr_comment"> */</em>
<a class="jxr_linenumber" name="48" href="#48">48</a>  
<a class="jxr_linenumber" name="49" href="#49">49</a>  <strong class="jxr_keyword">package</strong> org.jboss.netty.util.internal.jzlib;
<a class="jxr_linenumber" name="50" href="#50">50</a>  
<a class="jxr_linenumber" name="51" href="#51">51</a>  <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">class</strong> Adler32 {
<a class="jxr_linenumber" name="52" href="#52">52</a>  
<a class="jxr_linenumber" name="53" href="#53">53</a>      <em class="jxr_comment">// largest prime smaller than 65536</em>
<a class="jxr_linenumber" name="54" href="#54">54</a>      <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> BASE = 65521;
<a class="jxr_linenumber" name="55" href="#55">55</a>      <em class="jxr_comment">// NMAX is the largest n such that 255n(n+1)/2 + (n+1)(BASE-1) &lt;= 2^32-1</em>
<a class="jxr_linenumber" name="56" href="#56">56</a>      <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> NMAX = 5552;
<a class="jxr_linenumber" name="57" href="#57">57</a>  
<a class="jxr_linenumber" name="58" href="#58">58</a>      <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">long</strong> adler32(<strong class="jxr_keyword">long</strong> adler, byte[] buf, <strong class="jxr_keyword">int</strong> index, <strong class="jxr_keyword">int</strong> len) {
<a class="jxr_linenumber" name="59" href="#59">59</a>          <strong class="jxr_keyword">if</strong> (buf == <strong class="jxr_keyword">null</strong>) {
<a class="jxr_linenumber" name="60" href="#60">60</a>              <strong class="jxr_keyword">return</strong> 1L;
<a class="jxr_linenumber" name="61" href="#61">61</a>          }
<a class="jxr_linenumber" name="62" href="#62">62</a>  
<a class="jxr_linenumber" name="63" href="#63">63</a>          <strong class="jxr_keyword">long</strong> s1 = adler &amp; 0xffff;
<a class="jxr_linenumber" name="64" href="#64">64</a>          <strong class="jxr_keyword">long</strong> s2 = adler &gt;&gt; 16 &amp; 0xffff;
<a class="jxr_linenumber" name="65" href="#65">65</a>          <strong class="jxr_keyword">int</strong> k;
<a class="jxr_linenumber" name="66" href="#66">66</a>  
<a class="jxr_linenumber" name="67" href="#67">67</a>          <strong class="jxr_keyword">while</strong> (len &gt; 0) {
<a class="jxr_linenumber" name="68" href="#68">68</a>              k = len &lt; NMAX? len : NMAX;
<a class="jxr_linenumber" name="69" href="#69">69</a>              len -= k;
<a class="jxr_linenumber" name="70" href="#70">70</a>              <strong class="jxr_keyword">while</strong> (k &gt;= 16) {
<a class="jxr_linenumber" name="71" href="#71">71</a>                  s1 += buf[index ++] &amp; 0xff;
<a class="jxr_linenumber" name="72" href="#72">72</a>                  s2 += s1;
<a class="jxr_linenumber" name="73" href="#73">73</a>                  s1 += buf[index ++] &amp; 0xff;
<a class="jxr_linenumber" name="74" href="#74">74</a>                  s2 += s1;
<a class="jxr_linenumber" name="75" href="#75">75</a>                  s1 += buf[index ++] &amp; 0xff;
<a class="jxr_linenumber" name="76" href="#76">76</a>                  s2 += s1;
<a class="jxr_linenumber" name="77" href="#77">77</a>                  s1 += buf[index ++] &amp; 0xff;
<a class="jxr_linenumber" name="78" href="#78">78</a>                  s2 += s1;
<a class="jxr_linenumber" name="79" href="#79">79</a>                  s1 += buf[index ++] &amp; 0xff;
<a class="jxr_linenumber" name="80" href="#80">80</a>                  s2 += s1;
<a class="jxr_linenumber" name="81" href="#81">81</a>                  s1 += buf[index ++] &amp; 0xff;
<a class="jxr_linenumber" name="82" href="#82">82</a>                  s2 += s1;
<a class="jxr_linenumber" name="83" href="#83">83</a>                  s1 += buf[index ++] &amp; 0xff;
<a class="jxr_linenumber" name="84" href="#84">84</a>                  s2 += s1;
<a class="jxr_linenumber" name="85" href="#85">85</a>                  s1 += buf[index ++] &amp; 0xff;
<a class="jxr_linenumber" name="86" href="#86">86</a>                  s2 += s1;
<a class="jxr_linenumber" name="87" href="#87">87</a>                  s1 += buf[index ++] &amp; 0xff;
<a class="jxr_linenumber" name="88" href="#88">88</a>                  s2 += s1;
<a class="jxr_linenumber" name="89" href="#89">89</a>                  s1 += buf[index ++] &amp; 0xff;
<a class="jxr_linenumber" name="90" href="#90">90</a>                  s2 += s1;
<a class="jxr_linenumber" name="91" href="#91">91</a>                  s1 += buf[index ++] &amp; 0xff;
<a class="jxr_linenumber" name="92" href="#92">92</a>                  s2 += s1;
<a class="jxr_linenumber" name="93" href="#93">93</a>                  s1 += buf[index ++] &amp; 0xff;
<a class="jxr_linenumber" name="94" href="#94">94</a>                  s2 += s1;
<a class="jxr_linenumber" name="95" href="#95">95</a>                  s1 += buf[index ++] &amp; 0xff;
<a class="jxr_linenumber" name="96" href="#96">96</a>                  s2 += s1;
<a class="jxr_linenumber" name="97" href="#97">97</a>                  s1 += buf[index ++] &amp; 0xff;
<a class="jxr_linenumber" name="98" href="#98">98</a>                  s2 += s1;
<a class="jxr_linenumber" name="99" href="#99">99</a>                  s1 += buf[index ++] &amp; 0xff;
<a class="jxr_linenumber" name="100" href="#100">100</a>                 s2 += s1;
<a class="jxr_linenumber" name="101" href="#101">101</a>                 s1 += buf[index ++] &amp; 0xff;
<a class="jxr_linenumber" name="102" href="#102">102</a>                 s2 += s1;
<a class="jxr_linenumber" name="103" href="#103">103</a>                 k -= 16;
<a class="jxr_linenumber" name="104" href="#104">104</a>             }
<a class="jxr_linenumber" name="105" href="#105">105</a>             <strong class="jxr_keyword">if</strong> (k != 0) {
<a class="jxr_linenumber" name="106" href="#106">106</a>                 <strong class="jxr_keyword">do</strong> {
<a class="jxr_linenumber" name="107" href="#107">107</a>                     s1 += buf[index ++] &amp; 0xff;
<a class="jxr_linenumber" name="108" href="#108">108</a>                     s2 += s1;
<a class="jxr_linenumber" name="109" href="#109">109</a>                 } <strong class="jxr_keyword">while</strong> (-- k != 0);
<a class="jxr_linenumber" name="110" href="#110">110</a>             }
<a class="jxr_linenumber" name="111" href="#111">111</a>             s1 %= BASE;
<a class="jxr_linenumber" name="112" href="#112">112</a>             s2 %= BASE;
<a class="jxr_linenumber" name="113" href="#113">113</a>         }
<a class="jxr_linenumber" name="114" href="#114">114</a>         <strong class="jxr_keyword">return</strong> s2 &lt;&lt; 16 | s1;
<a class="jxr_linenumber" name="115" href="#115">115</a>     }
<a class="jxr_linenumber" name="116" href="#116">116</a> 
<a class="jxr_linenumber" name="117" href="#117">117</a>     <strong class="jxr_keyword">private</strong> Adler32() {
<a class="jxr_linenumber" name="118" href="#118">118</a>         <em class="jxr_comment">// Utility class</em>
<a class="jxr_linenumber" name="119" href="#119">119</a>     }
<a class="jxr_linenumber" name="120" href="#120">120</a> }
</pre>
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